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play_song.php?name=birthday_jackblack.php has a birthday. We have a birthday song for play_song.php?name=birthday_jackblack.php. When you celebrate a birthday for play_song.php?name=birthday_jackblack.php by giving a birthday song to play_song.php?name=birthday_jackblack.php, it means Happy Birthday play_song.php?name=birthday_jackblack.php.